Red Hat Bugzilla – Bug 980327
[RFE] QCOW2v3 support for external snapshots
Last modified: 2016-04-26 10:30:53 EDT
Support creating external snapshots with QCOW2v3 features.
Currently, libvirt creates inactive external snapshots by calling qemu-img, for active (live) external snapshots it uses the blockdev-snapshot-sync QMP command and lets QEMU create them.
For inactive snapshots, libvirt only needs to supply the requested features (and compat level) to qemu-img on the command line.
For active snapshots, libvirt will have to create the file and use 'mode': 'existing' parameter of blockdev-snapshot-sync.